Deflection device for a projection apparatus, projection apparatus for projecting an image and method for controlling a deflection apparatus for a projection apparatus

摘要

The invention relates to a deflection device for a projection apparatus for projecting Lissajous figures onto an observation field which is made to deflect a light beam about at least one first and one second deflection axis for generating Lissajous figures having a deflection unit for producing oscillations about the deflection axes and having a control apparatus for producing control signals for the deflection unit having a first and second control frequency which substantially corresponds to the resonant frequencies of the deflection unit, wherein the deflection unit has a quality factor of >3,000 and the control apparatus includes a feedback loop which is configured to regulate the first and/or second control frequencies in dependence on a measured phasing of the oscillations of the deflection unit so that the maximum amplitude of the oscillations remains in the resonant range of the deflection unit. The invention further relates to a projection apparatus having such a deflection device as well as to a method for controlling a corresponding deflection device.

主权项

1. A deflection device for a projection apparatus for projecting one or more Lissajous figures onto an observation field, which is configured to deflect a light beam about at least one first and one second deflection axes for generating one or more Lissajous figures, the deflection device comprising:
a deflection unit, configured for producing oscillations about the deflection axes; and a control apparatus, configured for producing one or more control signals for the deflection unit, the control signals having a first and second control frequencies that substantially correspond to resonant frequencies of the deflection unit; and wherein the deflection unit has a quality factor of >3,000; and wherein the control apparatus includes a first feedback loop that is configured to regulate the first and/or second control frequencies in dependence on a measured phasing of the oscillations of the deflection unit so that a maximum amplitude of the oscillations remains in a resonant range of the deflection unit, such that the control frequencies do not have a substantially fixed integer number ratio.